usaco clocks 题解，目标要找一个最小的移动顺序将所有的指针指向12点。下面原表格列出了9种不同的旋转指针的方法，每一种方法都叫一次移动。选择1到9号移动方法，将会使在表格中对应的时钟的指针顺时针旋转90度。-usaco clocks problem solution, the goal to find a minimum order of the mobile pointer pointing to 12:00. The original table below lists the nine different rotating pointer, each method call the first move. 1-9 Mobile, will make the hands of the clock in the table corresponds to 90 degrees clockwise.